CN106097948A - Image processing method, image processing circuit and use its display device - Google Patents

Image processing method, image processing circuit and use its display device Download PDF

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CN106097948A
CN106097948A CN201610228075.4A CN201610228075A CN106097948A CN 106097948 A CN106097948 A CN 106097948A CN 201610228075 A CN201610228075 A CN 201610228075A CN 106097948 A CN106097948 A CN 106097948A
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image
hdr
roll
sdr
gamma curve
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CN106097948B (en
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朴龙珉
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LG Display Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/026—Control of mixing and/or overlay of colours in general
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0457—Improvement of perceived resolution by subpixel rendering
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Picture Signal Circuits (AREA)

Abstract

Disclose a kind of image processing method and circuit and use its display device, it is used for making the deterioration in image quality minimum of HDR (HDR) image and showing this image in standard dynamic range (SDR) display device, and there is no the gamma transformation of data-driven integrated circuit (IC).Described image processing method includes: corresponding to selecting among multiple gamma curves of display device to have the first image and the gamma curve of minimum integrated brightness error, described first image has HDR (HDR), in order in the display device with standard dynamic range (SDR), display has described first image of HDR；With the gamma curve according to described selection, described first image is converted to second image with SDR.

Description

Image processing method, image processing circuit and use its display device
This application claims the korean patent application No.10-2015-0060518 submitted on April 29th, 2015 Priority, here cite this patent application as reference, as illustrated the most completely.
Technical field
The present invention relates to a kind of display device, particularly relate to a kind of image processing method and circuit and use Its display device, be used for making the deterioration in image quality of HDR (HDR) image minimum and Standard dynamic range (SDR) display device shows this image.
Background technology
In general, captured image needs digitized, in order to show this image on the display apparatus. In this case, gamma coding and gamma decoding process are needed.Gamma coding is for comprising finger as much as possible Determine the bulk information in bandwidth (such as, 8 bit image signals have the gray level of 256), according to people The cognitive features of vision, compared with the high brightness cycle, gamma coding becomes for the brightness in the low-light level cycle Change rdativery sensitive, that is, gamma coding has nonlinear characteristic.Consider this point, encode gamma Process use non-linear transfer function, non-linear transfer function according to use 2.4 inverse as index Recommendation (Recommendation, Rec.) 709 and Rec.1886 standard is defined.In order to by gal The image of horse coding is converted to the brightness initially wanted of each gray level, and display device is in view of having index The function of 2.4, as the inverse function of the transfer function used in coding, determines gamma reference voltage.
The display device considered according to conventional Rec.709 standard is cathode ray tube (CRT), thus This display device has about 0 to 100cd/m2Narrow dynamic range.But, 2.4 for CRT's Dynamic range is suitable, thus when dynamic range increases, 2.4 are not suitable for the cognitive special of people's vision Property.It practice, people has about 10 in real world-4-108cd/m2Wide dynamic range.Given this Technology be HDR (HDR), the most up to now, HDR technology has focused largely on camera Field.
Recently, there is HDR to extend to the trend of image making, display development etc., and representative Ground discuss and establish film and Television Engineer association (SMPTE) standard (ST.) 2084 standard, Blu-ray Disc association (BDA) HDR standard etc..SMPTE ST.2084 standard refers to be used for HDR The electro-optic conversion function (EOTF) of the HDR image coding of display device, it is also called perception amount Change (PQ, perceptual quantizer).
As it has been described above, gamma coding is for comprising the bulk information in nominated bandwidth as much as possible, decoding is For the information of coding being converted to the process that original intensity is expressed.Therefore, encode and decoding has inverse letter The relation of number, thus when coding function is different with decoding functions, inevitably lead to picture quality bad Change.
That is, although HDR image needs have the figure than standard dynamic range (SDR) figure image height Picture element amount, but when showing HDR image in conventional SDR display device, due to different codings Function and decoding functions, compared with SDR image, the deterioration in image quality of HDR image.
This is because the SDR display device of most conventional uses according to conventional SDR standard (Rec.709/Rec.1886) gamma defined is to decode image, hence without decoding according to HDR standard (ST.2084) HDR image encoded, even if this also will not be by when the dynamic range of display device increases Overcome.
On the other hand, in meeting the situation of display device of HDR standard (ST.2084), HDR Image is displayed, but SDR image is not displayed.
In order to overcome these problems, need to comprise in a display device smart with by the transfer function of picture coding The most corresponding decoding functions.Therefore, for display device in order to suitably show SDR image and Both HDR image, it is desirable to comprise the respective decoding of SDR and HDR in data-driven IC Function EOTF, but this problem relating to high cost.
Summary of the invention
Therefore, the present invention relates to a kind of substantially avoid cause due to restriction and the shortcoming of prior art The image processing method of one or more problems, image processing circuit and use its display device.
It is an object of the present invention to provide a kind of image processing method and circuit and use its display to fill Putting, the deterioration in image quality being used for making HDR (HDR) image is minimum and dynamic in standard Scope (SDR) display device shows this HDR image, and there is no data-driven integrated circuit (IC) gamma transformation.
In the following description part being listed the further advantage of the present invention, purpose and feature, these are excellent A part for point, purpose and feature will become aobvious according to explanation below for those of ordinary skill in the art And be clear to or can be understood by the enforcement of the present invention.By in description, claims and drawings The structure particularly pointed out can realize and obtain object of the present invention and other advantages.
In order to realize these purposes and other advantages and according to the purpose of the present invention, such as and summary concrete at this Describe, a kind of image processing method, including: among corresponding to multiple gamma curves of display device Selecting have the first image and the gamma curve of minimum integrated brightness error, described first image has high dynamic State scope (HDR), in order to show tool in the display device with standard dynamic range (SDR) There is described first image of HDR；With the gamma curve according to described selection by described first image conversion For having second image of SDR.
Select described gamma curve to comprise the steps that described first image to be mapped to that there is different high-high brightness Each of the plurality of gamma curve, to calculate luminance errors at each frame, accumulates the bright of described calculating Degree error, and for each detection integrated brightness error of the plurality of gamma curve；Described many Select there is described minimum integrated brightness by mistake among the described integrated brightness error of each of individual gamma curve The described gamma curve of difference；With the high-high brightness of gamma curve determining and exporting described selection.
Described first image is converted to described second image comprise the steps that corresponding to each gamma curve Preset selection among HDR-SDR conversion lookup table (LUT) corresponding with the described high-high brightness determined LUT；With the LUT using described selection, described first image is mapped as described second image.
Before any one in selecting the plurality of gamma curve, described image processing method can enter one Step includes: the result obtained based on the analysis by described first image, determines rolling according to picture characteristics Fall flex point；With to the high grade grey level equal to or more than the described flex point of roll-offing determined in described first image Carry out process of roll-offing.
Flex point of roll-offing described in determining comprises the steps that the rectangular histogram analyzing described first image, high to calculate n% Or higher high gray scale frequency, and determine described rolling according to the high gray scale frequency adaptability of described calculating Fall flex point, wherein n is less than the natural number of 100.
Before analyzing described first image, described image processing method can farther include: according to option Image determines that input picture is HDR image or SDR image；Be SDR when described input picture Described input picture is walked around during image, and when described input picture is HDR image by described input Image provides as described first image.
In another aspect of the present invention, a kind of image processing circuit, including: roll-off processor, institute State the processor that roll-offs analysis based on the first image by having HDR (HDR) and obtain Result, determine, according to picture characteristics, flex point of roll-offing, and in described first image equal to or more than institute The high grade grey level stating the flex point of roll-offing determined carries out process of roll-offing, in order to have standard dynamic range (SDR) in display device, display has described first image of HDR；And image mapper, institute State image mapper for having described corresponding to selection among multiple gamma curves of described display device First image and the gamma curve of minimum integrated brightness error, and the gamma curve according to described selection will Described first image is converted to second image with SDR.
The described processor that roll-offs comprises the steps that histogram analyzer, and described histogram analyzer analyzes described the The rectangular histogram of one image, to calculate and to export, n% is high or higher high gray scale frequency, and wherein n is less than The natural number of 100；With the flex point determiner that roll-offs, described in roll-off the flex point determiner height according to described calculating Roll-off described in determining flex point gray scale frequency adaptability.
Described image mapper comprises the steps that integrated brightness error detector, described integrated brightness error-detecting Described first image is mapped to each of the plurality of gamma curve with different high-high brightness by device, To calculate luminance errors at each frame, accumulate the luminance errors of described calculating, and for the plurality of gal Each detection integrated brightness error of horse curve；High-high brightness determiner, described high-high brightness determiner Among the described integrated brightness error of each of the plurality of gamma curve, select that there is described minimum tire out The described gamma curve of long-pending luminance errors, and determine and export gamma curve the most light of described selection Degree；With HDR-SDR transducer, described HDR-SDR transducer is corresponding to each gamma curve Preset selection among HDR-SDR conversion lookup table (LUT) corresponding with the described high-high brightness determined LUT, and use the LUT of described selection that described first image is mapped as described second image.
Described image processing circuit can farther include: the inner pressurd vessel in processor front of roll-offing described in being arranged on Selector, described inner pressurd vessel selector according to option image determine input picture be HDR image or SDR image, walks around described input picture when described input picture is SDR image, and when described When input picture is HDR image, described input picture is roll-offed described in described first image provides extremely Processor.
In another aspect of the present invention, a kind of display device, including: display floater；Image procossing Circuit；Panel driver, described panel driver is for showing from described image in described display floater Process the image that circuit provides；And time schedule controller, described time schedule controller is used for controlling described panel and drives The driver' s timing of dynamic device, wherein said image processing circuit is arranged in described time schedule controller, is arranged on Between described time schedule controller and described panel driver or be arranged on the front end of described time schedule controller Place.
Described display device can farther include: back light unit, and described back light unit is for described display Panel irradiates light；And backlight driver, described backlight driver is in response to from described time schedule controller The light modulation value of output adjusts the brightness of described back light unit, and described light modulation value uses by described image procossing The described high-high brightness that circuit determines.
Should be appreciated that foregoing general description of the present invention and detailed description below be all exemplary and Explanatory, it is intended that provide further explanation to claimed invention.
Accompanying drawing explanation
There is provided the accompanying drawing being further appreciated by and being incorporated herein forming the application part to illustrate to the present invention Embodiments of the present invention, and for explaining the principle of the present invention together with description.In the accompanying drawings:
Fig. 1 is to understand the present invention, and the PQ being shown as HDR transfer function (ST.2084) compiles Code curve and the gamma coded curve according to standard dynamic range (SDR) transfer function (Rec.1886) Between the chart of contrast；
Fig. 2 is to understand the present invention, and the PQ being shown as HDR transfer function (ST.2084) solves Code curve and the figure according to the contrast between the gamma decoding curve of SDR transfer function (Rec.1886) Table；
Fig. 3 is to understand the present invention, and diagram is when the gray level of HDR image is according to 2.2 gamma curves The example of gradation loss is there is time mapped；
Fig. 4 is the schematic frame of the assembly illustrating image processing circuit according to an embodiment of the present invention Figure；
Fig. 5 is for explaining that cutting (clipping) processes and roll-off (roll-off) shown in Fig. 4 Being used for the chart of saturated for the high gray scale contrast between processing of roll-offing minimized of processor；
Fig. 6 A and 6B illustrates the example of the histogram analysis of HDR image, and it is for explaining according to figure The method that the picture characteristics of the processor that roll-offs shown in 4 determines starting point of roll-offing adaptively；
Fig. 7 is the block diagram of the intraware of the integrated brightness Error Calculator shown in schematic thinking 4；
Fig. 8 is the flow chart progressively illustrating image processing method according to an embodiment of the present invention；
Fig. 9 is the liquid crystal indicator of diagram application image processing circuit according to an embodiment of the present invention The block diagram of example.
Detailed description of the invention
Fig. 1 is to understand the present invention, and the PQ being shown as HDR transfer function (ST.2084) compiles Code curve and the gamma coded curve according to standard dynamic range (SDR) transfer function (Rec.1886) Between the chart of contrast.
Consider that the SMPTE ST.2084 of HDR display device can have 0 to 10,000cd/m2Dynamic Scope, this dynamic range allows for 0 to 100cd/m than conventional SDR display device2Much broader Dynamic range and determine.Therefore, by the ST.2084 transfer function of HDR image coding with by SDR The BT.1886 transfer function of picture coding can have the biggest difference.
It will be seen from figure 1 that PQ coded curve and gamma coded curve have the biggest difference, institute State PQ coded curve demonstrate gray level according to the ST.2084 transfer function as HDR standard with The graph of a relation of brightness, described gamma coded curve demonstrates and turns according to the BT.1886 as SDR standard The gray level of exchange the letters number and the graph of a relation of brightness.
The present invention proposes a kind of method, and described method is for meeting SDR transfer function (Rec.709/Rec.1886) SDR display device realizes the SDR with minimum image quality deterioration Image and HDR image, and there is no the gamma transformation of drive integrated circult (IC).
To this end, the basic conception of the present invention can be regarded as according to HDR transfer function (ST.2084), i.e. The image of PQ coding is to the number of the image encoded according to SDR transfer function (Rec.709/Rec.1886) According to conversion.
Fig. 2 is the basic conception in order to understand the present invention, is shown as HDR transfer function ST.2084 (=PQ) PQ curve at decoding time point is decoding at time point with according to SDR transfer function The chart of the contrast between 2.2 gamma curves.
With reference to Fig. 2, need to be shown as in a display device according to 150 gray levels of the image of PQ coding About 250nit, but its in the SDR display device that maximum is 400nit meet gamma 2.2 not 120nit can be shown as with avoiding.Therefore, as described in the discussion of prior art, HDR image quilt SDR display device shows dark.
On the other hand, with reference to Fig. 2, when 150 gray levels of HDR image are become by SDR display device During (being mapped as) 180 gray level, 150 gray levels can be shown as identical with the situation of coding Value, i.e. 250nit.
But, this simple data mapping method may result in Railway Project.First, in same bandwidth In (for example, it is assumed that PQ and 2.2 gammas are respectively provided with 8 bits), 1:1 pairing is impossible, thus Inevitably lead to gradation loss.The dynamic range of second, PQ is typically than the dynamic model of display device Enclose width.Therefore, in fig. 2, exceeded about according to 200 gray levels of the image of PQ coding 1,000nit, but it can not be shown in the SDR display device that maximum is 400nit, thus High grade grey level luminance saturation, thus cause gray scale to be gathered in high grade grey level.
Fig. 3 is illustrated in the gray level of HDR image that will encode according to 2.2 gamma curves according to aforementioned PQ Carry out in the situation of data mapping, the example of gradation loss occurs.
From figure 3, it can be seen that along with SDR display device high-high brightness 400,800,1000, 1500,2000 and 4000 increase, and the loss in low gray level increases.Imperfectly, compile according to PQ 16 gray levels of code are mapped to 6 gray scales in the 2.2 gamma display devices that maximum is 400nit Level, but it is mapped to 2 gray levels in the 2.2 gamma display devices that maximum is 4000nit, because of And can be seen that and higher gradation loss occurs in low gray level.
In order to overcome these problems, the present invention proposes a kind of image processing method and image processing circuit, It is used for the gradation loss caused according to the mapping of SDR gamma curve due to HDR image and works as The dynamic range of HDR image is satisfied than contingent high gray scale during the wide dynamic range of SDR display device With minimize.
Fig. 4 is assembly schematic illustrating image processing circuit 50 according to an embodiment of the present invention Block diagram.
Image processing circuit 50 shown in Fig. 4 can include content selector 10, roll-off (roll-off) Processor 20 and image mapper 30.The processor 20 that roll-offs can include histogram analyzer 22, Flex point of roll-offing determiner 24 and the computer 26 that roll-offs.Image mapper 30 can include that integrated brightness is by mistake Difference detector 32, high-high brightness determiner 34 and HDR-SDR transducer 36.
Content selector 10 can receive input picture RGB and option information and according to option from external source Information determines that input picture RGB is HDR image or SDR image.Option information can include representing Input picture RGB is the image information of HDR image or SDR image.When input picture RGB is During HDR image, input picture RGB is exported to the processor 20 that roll-offs by content selector 10, and When input picture RGB is SDR image, content selector 10 is by input picture RGB output extremely number According to driver.
Before the HDR image provided from content selector 10 is mapped as SDR image, in order to make Via the saturated minimum of high gray scale mapped, it is whole that the processor 20 that roll-offs can use for by high gray areas Body brightness adjustment is dark processing scheme of roll-offing.Particularly, roll-offing processor 20 can be according to by analyzing The picture characteristics that the HDR image of input is obtained performs process of roll-offing adaptively.Roll-off processor 20 can determine that flex point (starting point of roll-offing), thus by due to high gray scale is saturated and flex point causes figure picture element Amount deterioration minimum, described flex point represents the grayscale position starting to roll-off according to picture characteristics adaptively.Change Sentence is talked about, and the processor 20 that roll-offs can analyze rectangular histogram based on HDR image, with high according to n% or more High high gray scale frequency adaptability ground determines flex point of roll-offing (starting point of roll-offing), and performs and export institute The high gray scale of the flex point determined or the process of roll-offing of higher gray scale.
To this end, roll-off, processor 20 comprises the steps that histogram analyzer 22, histogram analyzer 22 points Analyse rectangular histogram based on HDR image and export that n% is high or higher high gray scale frequency；Flex point of roll-offing is true Determining device 24, flex point of roll-offing determiner 24 is fitted according to the high gray scale frequency determined from histogram analyzer 22 Determine flex point of roll-offing to answering property；And the computer 26 that roll-offs, roll-off computer 26 to determined by flex point High grade grey level or more high grade grey level perform roll-off process calculating.
Fig. 5 is the chart of the method for roll-offing for explaining the processor 20 that roll-offs shown in Fig. 4.
In Figure 5, dotted line represents when the dynamic range of input picture is than the wide dynamic range of display device Simple cutting (clipping) method.Such as, the method can be to work as in HDR image with 170 When brightness corresponding to gray level is 400nit, all high grade grey levels of 170 or bigger are become 170 Method.
On the other hand, dotted line as shown in Figure 5 represents, roll-offing is that any gray level is determined by one For flex point and make this flex point bending change method.In this, although height can be reduced compared with cutting Gray level is saturated, but is capable of identify that deterioration in image quality based on this flex point, thus can be schemed by input The analysis of picture determines this flex point adaptively.In other words, the processor 20 that roll-offs can be schemed by HDR The histogram analysis of picture determines flex point adaptively according to picture characteristics so that owing to high gray scale is saturated and The deterioration in image quality that flex point causes is minimum.
Fig. 6 is to carry out adaptability for explanation according to the picture characteristics of the processor 20 that roll-offs shown in Fig. 4 Ground determines the diagram of the method for starting point of roll-offing.
Fig. 6 A and 6B illustrates the example of HDR image histogram analysis, in this example, X-axis table Showing normalized brightness, Y-axis represents frequency.
The transfer function (ST.2084) HDR image encoded, i.e. PQ EOTF can be according to following Equation 1 defines, and equation 1 below can be used to obtain the brightness for input gray grade.
[equation 1]
L = ( max [ ( N 1 / m 2 - c 1 ) , 0 ] c 2 - c 3 N 1 / m 1 ) 1 / m 1
In superincumbent equation 1, L is brightness, and N is input gray grade, m1To m2And c1To c3 It it is each constant.Such as, m1=2610/4096 × (1/4)=0.1593017578125, m2=2523/4096 × 128=78.84375, c1=3424/4096=0.8359375=c3-c2+ 1, c2=2413/4096 × 32=18.8515625, c3=2392/4096 × 32=18.6875.
In there is the situation of dark image of a little high gray areas as shown in FIG, flex point of roll-offing position At relatively high grade grey level it does not matter whether, but there is many high gray areas as depicted in figure 6b Bright image situation in, flex point of preferably roll-offing be positioned at as far as possible in low gray level and in view of figure Image brightness is determined.
In detail, flex point of roll-offing determiner 24 is it is contemplated that high from the n% of histogram analyzer 22 The frequency of high gray areas, determines the flex point (Roll-off that roll-offs according to equation 2 belowpos)。
[equation 2]
If the quantity of gray scale (n) > threshold value, Roll-offpos=(1-a) × Roll-offinitial
Otherwise Roll-offpos=Roll-offinitial
When the frequency " quantity of gray scale (n) " of high gray areas high for n% is higher than threshold value, flex point of roll-offing “Roll-offpos" " (1-a) × Roll-off can be confirmed asinitial", additionally, " flex point of roll-offing (Roll- offpos) " the initially set initial flex point " Roll-off that roll-offs can be confirmed asinitial”.Here, " a " is experimental constant, and " a " increases along with brightness and increase and reduce along with luminance-reduction. " a " can be the experience number by experiment and can be set to and have the bright of fixing minimum and maximum value Degree is linearly.Initial flex point " the Roll-that roll-offs can be pre-set according to the high-high brightness of display device offinitial”。
Roll-off computer 26 can according to equation 3 below to the flex point determiner 24 that roll-offs according to earlier figures picture Flex point of roll-offing determined by analysis " Roll-offpos" and input gray grade " Grayin" perform multiplication fortune Calculate, the output gray level " Gray of process of roll-offing with outputout”。
[equation 3]
Grayout=(Roll-offpos)×(Grayin)
Such as, in the image with 100 × 100 Pixel Dimensions, can be at R, G, B gradation data item Among detect each pixel maximum GrayMax (when gradation data has 8 bit, 0≤GrayMax≤255).When rectangular histogram is formed by the maximum GrayMax of each pixel, X-axis Being the gray level in the range of 0 to 255, Y-axis is frequency.Such as, it is contemplated that 10% high high gray area The frequency (100 × 100 × 0.1) in territory determines the flex point " Roll-off that roll-offspos”。
Meet the initial X=255 of condition (rectangular histogram [X]+rectangular histogram [X-1]+...+rectangular histogram [X-m]) > (100 × 100 × 0.1)) 10% high high gray areas pair of gray level (X-m) and respective image Should.When image all dark time, (X-m) can be close to 0, and when image is bright, (X-m) can connect Nearly 255.
Such as, when for determining that the gray level that threshold hypothesis is 192 of flex point of roll-offing and (X-m) are less than When 192, a=0 and the flex point " Roll-off that roll-offspos" can be identified as not adjusting and being intended to roll-off Initial flex point " Roll-offinitial”。
On the other hand, when (X-m) more than 192 time, a > 0 and with the initial flex point " Roll-that roll-offs offinitial" compare, flex point of roll-offing " Roll-offpos" can be changed into close to 0.
In the diagram, image mapper 30 is alternatively used for the gamma curve making deterioration in image quality minimum And HDR image is mapped to SDR image by the gamma curve selected by Shi Yonging, so that leading owing to mapping The gradation loss caused is minimum.In other words, image mapper 30 can be by receiving the processor 20 that roll-offed Carry out roll-offing the HDR image processed and calculate accumulation from multiple gamma curves with different brightness bright Degree error, performs image on the gamma curve with minimum integrated brightness error and maps.
To this end, image mapper 30 comprises the steps that integrated brightness error detector 32, integrated brightness error Detector 32 inputs from the processor 20 that roll-offs by mapping according to multiple gamma curves with different brightness HDR image detect integrated brightness error, to calculate and to accumulate the luminance errors of each frame；Maximum Brightness determiner 34, high-high brightness determiner 34 is for from integrated brightness error detector 32 Select the gamma curve with minimum error among integrated brightness error, and the gamma selected by output is bent The high-high brightness (L) of line；And HDR-SDR transducer 36, HDR-SDR transducer 36 is used for High-high brightness determined by according to (L) uses HDR-SDR look-up table (LUT) HDR image to be turned It is changed to SDR image, and the SDR image of conversion is exported to data driver.Here, accumulate bright Degree error detector 32 and HDR-SDR transducer 36 can be implemented with the form of LUT.
The method that by the mapping of image mapper 30 make deterioration in image quality minimum is described below.
As described above with reference to Figure 2, for gamma curve, along with high-high brightness increases, low gray scale Mapping can become more difficult, and variable easy of high grey scale mapping.At HDR-SDR mapping process In, along with more brightness are by the initial representation all pixels in the image encoded according to PQ, can obtain Obtain this characteristic and deterioration in image quality can be made minimum, thus image mapper 30 may select and map tool There is the gamma curve of minimum image quality deterioration.
In other words, image mapper 30 may utilize 100-Max nit gamma curve as shown in Figure 7 Calculate integrated brightness error, select the gamma curve with minimum integrated brightness error, and selected Perform image on gamma curve to map.
When according to Equation for Calculating integrated brightness error, circuit load may become more serious, thus tired Long-pending luminance errors detector 32 can be implemented with the form of LUT according to equation 4 below.
[equation 4]
I=input gray grade, n is bit number, and r is gamma index (gamma exp, such as 2.2),
Equation 1 above is with reference to PQ (i), Gamma (i)=(i/ (2n-1))r,
Minimum brightness difference LUT (i)=(PQ (i)-Gamma (i))/PQ (i)
High-high brightness determiner 34 can be in the integrated brightness error exported from integrated brightness error detector 32 Among select to have the gamma curve of minimum integrated brightness error, and the maximum of the gamma curve by selection Brightness (L) exports to HDR-SDR transducer 36.In order to prevent owing to unexpected change or noise are led The flicker caused, high-high brightness determiner 34 uses the termporal filter (time filter) will be in the consecutive frame phase Between carry out waiting flat (level) with weighting from the high-high brightness (L) of high-high brightness determiner 34 output. Termporal filter can be infinite impulse response (IIR) wave filter.
When high-high brightness determiner 34 determines maximum according to the gamma curve with minimum integrated brightness error During brightness (L), HDR-SDR transducer 36 can use HDR-according to the high-high brightness (L) determined HDR image is converted to SDR image by SDR LUT.HDR-SDR LUT can be according to following side Journey 5 realizes in advance.In the range of PQ (i) may conform to aforementioned equation 1 above and can have 0 to 1 Value.(n is that the maximum number bits according to display device determines, 8 bits are 255 also for 0 to n And the gamma of r=display device) gray level, HDR-SDR LUT can be fixed according to equation 5 below Justice.
[equation 5]
HDR-SDR LUT (i)=Power (PQ (i) * 10,000/L, 1/r) × n
High-high brightness (L) according to gamma curve, HDR-SDR transducer 36 can include multiple The optional high-high brightness determined with high-high brightness determiner 34 of LUT, HDR-SDR transducer 36 (L) corresponding LUT, and by the LUT selected, HDR image is converted to SDR image.? In this situation, the high-high brightness (L) that HDR-SDR transducer 36 can will determine, i.e. have minimum tired The high-high brightness (L) of the gamma curve of long-pending luminance errors provides to light adjusting controller (not shown), because of And light adjusting controller can use aforementioned high-high brightness (L) to determine the back of the body for controlling liquid crystal indicator The light modulation gain of brightness.
Table 1 below shows and calculate seven by the integrated brightness error detector 32 shown in Fig. 4 The minimum integrated brightness error of image and the example of result that obtains.
In following table 1, left side brightness is corresponding to having the gamma curve of minimum integrated brightness error High-high brightness L.
From table 1 below it can be seen that image #1, #2 and #4 have 100nit gamma curve Little integrated brightness error, image #3 has minimum integrated brightness error in 200nit gamma curve, figure As #5 and #7 has minimum integrated brightness error in 300nit gamma curve, image #6 is at 500nit Gamma curve has minimum integrated brightness error.Therefore, can determine according to picture characteristics that having minimum tires out High-high brightness L of the gamma curve of long-pending luminance errors.
[table 1]
Fig. 8 is the flow chart progressively illustrating image processing method according to an embodiment of the present invention, the party Method can be performed by the image processing circuit 50 shown in Fig. 4, thus will be described in conjunction with Fig. 4.
When content selector 10 shown in input picture RGB to Fig. 4 in step 2 (S2), Option image is used to determine that input picture RGB is HDR image or SDR in step 4 (S4) Image.
When determining that input picture RGB is HDR image in step 4 (S4):
In step 6 (S6), before HDR image is mapped, in order to make via data mapping The saturated minimum of high gray scale, the processor 20 that roll-offs can obtain according to by analyzing input HDR image Picture characteristics performs process of roll-offing adaptively.The processor 20 that roll-offs can be analyzed based on HDR image With or higher high gray scale frequency adaptability high according to n%, rectangular histogram, determines that flex point of roll-offing (has been roll-offed Point), and flex point or the high grade grey level thereon determined by process output that can roll-off.
Image mapper 30 can be chosen with the gamma of minimum image quality deterioration in step 8 (S8) Curve, and use the gamma curve selected HDR image to be mapped as in step 10 (S10) SDR image, so that owing to image maps the gradation loss minimum caused.Image mapper 30 can use Integrated brightness error LUT being respectively provided with according to multiple gamma curves with different high-high brightness, pin Integrated brightness error to the HDR image that the detection of each gamma curve provides from the processor 20 that roll-offs, Select the gamma curve with minimum integrated brightness error, and use the gamma curve of selection by HDR Image is converted to SDR image.
In step 12 (S12), in the SDR image of the middle conversion of step 10 (S10) or in step 4 (S4) SDR image determined in is output to data driver.Implement according to the present invention one when using When the image processing method of mode shows HDR image in SDR display device, initial with to HDR Image performs the situation of simple data mapping and compares, and can highlight and can improve picture quality.
Therefore, according to the present invention, the SDR display device of HDR standard (ST.2084) is not met yet The HDR image according to ST.2084 coding can also be realized with the deterioration in image quality minimized, thus Optionally show SDR image and HDR image, and do not have the gamma of data driver to change, thus The cost making data driver, time schedule controller etc. increases minimum.
Aforementioned image processing circuit according to the present invention and method also apply be applicable to liquid crystal indicator, organic Light emitting display device etc. whole.
Fig. 9 is the liquid crystal indicator of diagram application image processing circuit according to an embodiment of the present invention The block diagram of example.
Liquid crystal indicator shown in Fig. 9 comprises the steps that the time schedule controller as panel driver 100, data driver 200 and gate drivers 300；Display floater 400；Gamma voltage generator 500；Back light unit 600；Backlight driver 700；Unshowned power subsystem etc..
Display floater 400 can be arranged to the pel array display image of matrix form by wherein pixel.Picture Each pixel of pixel array can include redness (R), green (G) and blue (B) sub-pixel.Separately On the one hand, each pixel can include having the white than RGB sub-pixel higher luminous efficiency by increase (W) sub-pixel and the R/W/B/G sub-pixel that formed.LCD, oled panel or similar face Plate can be applicable to display floater 400.
Data driver 200 can receive data controlling signal and view data from time schedule controller 100.Number Can be driven according to data controlling signal according to driver 200, can will be provided from gamma voltage generator 500 Benchmark gamma electric voltage group be subdivided into the grayscale voltage corresponding with each gray level of data, then can use Digital Image Data is converted to simulated image data signal by the grayscale voltage of segmentation.
Data driver 200 can include multiple data of the data wire for display floater 400 is operated alone Driving IC, each data-driven IC may be installed such as carrier tape package (TCP), chip on film (COF) and on the circuit film of flexible print circuit (FPC) etc, and tape automated bonds is used (TAB) method is attached to display floater 400 or chip on glass (COG) method can be used to install On display floater 400.
Gate drivers 300 can use the grid control signal provided from time schedule controller 400 to be operated alone The a plurality of gate line of display floater 400.Gate drivers 300 may be in response to grid control signal accordingly The scanning impulse of gate-on voltage is provided to every gate line by the scan period, and in remaining cycle Middle offer grid off voltage.Gate drivers 300 can receive grid from time schedule controller 100 and control letter Number or receive grid control signal from time schedule controller 100 by data driver 200.Raster data model Device 300 can include at least one grid IC and may be installed such as TCP, COF and FPC etc On circuit film, and TAB method is used to be attached to display floater 400 or COG method can be used to install On display floater 400.On the other hand, gate drivers 300 can be with the picture of composition display floater 400 The thin film transistor (TFT) array of pixel array is formed together, thus is embodied as being arranged on the non-aobvious of display floater 400 Show the type of panel inner grid (GIP) in region.
Time schedule controller 100 can receive view data, clock signal etc. from external host system.Sequential control Device 100 processed can perform the image procossing of all image compensations as required etc and will scheme input image data As data export to data driver 200.Time schedule controller 100 can use input timing signal to produce and use In control respectively data driver 200 and gate drivers 300 driver' s timing data controlling signal and Grid control signal, and respectively data controlling signal and grid control signal are exported to data driver 200 and gate drivers 300.The clock signal provided to time schedule controller 100 from host computer system can wrap Include Dot Clock, data enable signal, vertical synchronizing signal, horizontal-drive signal, but can omit vertical same Step signal and horizontal-drive signal.When omitting vertical synchronizing signal and horizontal-drive signal, sequencing contro Device 100 to data enable signal-count according to Dot Clock and can produce and use vertical synchronizing signal and level Synchronizing signal.The data controlling signal provided to source electrode driver 200 from time schedule controller 100 can include The output of source electrode initial pulse, source electrode sampling clock, polarity control signal, source electrode enables signal etc..From time The grid control signal that sequence controller 100 provides to gate drivers 300 can include grid initial pulse, The output of gate shift clock, grid enables signal etc..
The image processing circuit 50 described with reference to Fig. 4 can be arranged on time schedule controller as shown in Figure 9 In 100, when may be provided between time schedule controller 100 and data driver 200 or may be provided at The input end of sequence controller 100.Image processing circuit 50 can determine that input image data is HDR figure As or SDR image, get around SDR image, and make the high gray scale of HDR image saturated and image Quality deterioration is minimum, HDR image to be mapped as SDR image and exports.Image processing circuit 50 Can determine according to HDR image characteristic and roll-off flex point and the high grade grey level equal to or more than flex point is performed rolling Fall processes, and thus makes the saturated minimum of high gray scale.Additionally, image processing circuit 50 can determine that have HDR The gamma curve of the minimum integrated brightness error of image, and will according to the gamma curve LUT determined HDR image is mapped as SDR image, so that deterioration in image quality is minimum.
The maximum that image processing circuit 50 can will determine from the gamma curve with minimum integrated brightness error Brightness (L) provides to the light adjusting controller being arranged in time schedule controller 100.Therefore, brightness adjustment control Device can use the high-high brightness (L) determined from image processing circuit 50 to determine for controlling back light unit The light modulation value of the brightness of 600, and light modulation value is provided to backlight driver 700.
Back light unit 600 can use the fluorescent lamp of such as CCFL and EEFL etc or include LED Full run-down type or edge type backlight as light source.Staight downward type backlight can include after display floater 400 Surface and arrange light source on the complete display area, the light guide plate being arranged on light source and multiple light Learning sheet, the light launched from light source is irradiated to liquid crystal panel 400 by multiple optical sheets by Staight downward type backlight. Edge type backlight can include the light guide plate of the rear surface in the face of display floater 400, be arranged in the face of light guide plate The light source at least one edge and multiple optical sheets of being arranged on light guide plate, edge type backlight leads to Cross light guide plate and the light launched from light source is converted to planar light, and light shine aobvious by multiple optical sheets Show panel 400.
Backlight driver 700 can adjust back light unit 600 according to the light modulation value from time schedule controller 100 Brightness.Backlight driver 700 can produce the pulsewidth modulation with the dutycycle corresponding with light modulation value (PWM) signal drive back light unit 600, thus control the brightness of back light unit 600.
Image processing method according to the present invention and circuit and use its display device can show at SDR Showing device will be converted to according to SDR standard code according to the HDR image data of HDR standard code Image, thus realize the SDR image of deterioration in image quality and the HDR image two with minimum error Person, and do not drive the gamma transformation of IC.
In other words, according to the image processing method of the present invention and circuit and use its display device can Determined that by the analysis of HDR image flex point of roll-offing, can be true so that the saturated minimum of high gray scale adaptively Surely there is the gamma curve of the minimum integrated brightness error of HDR image, and HDR image can be turned It is changed to SDR image, thus makes owing to HDR-SDR maps the gradation loss minimum caused.Therefore, The deterioration in image quality of HDR image can be minimized and HDR image may be output to SDR display dress Put.
Various amendment and change can be carried out in the present invention in the case of without departing substantially from the spirit or scope of the present invention Changing, this it will be apparent to those skilled in the art that.Thus, the invention is intended to covering and fall into The modifications and variations of the present invention in scope and equivalency range thereof.

Claims (12)

1. an image processing method, described method includes:
Bright with minimum accumulation there is the first image corresponding to selection among multiple gamma curves of display device The gamma curve of degree error, described first image has HDR (HDR), in order to have In the display device of standard dynamic range (SDR), display has described first image of HDR；With
Described first image is converted to second figure with SDR by the gamma curve according to described selection Picture.
Method the most according to claim 1, wherein selects described gamma curve to include:
Described first image is mapped to the plurality of gamma curve each with different high-high brightness Individual, to calculate luminance errors at each frame, accumulate the luminance errors of described calculating, and for described many Each detection integrated brightness error of individual gamma curve；
Described in selecting to have among the described integrated brightness error of each of the plurality of gamma curve The gamma curve of little integrated brightness error；With
Determine and export the high-high brightness of gamma curve of described selection.
Method the most according to claim 2, is wherein converted to described second by described first image Image includes:
Corresponding to selecting among default HDR-SDR conversion lookup table (LUT) of each gamma curve The LUT corresponding with the described high-high brightness determined；With
Described first image is mapped as described second image by the LUT using described selection.
4., according to the method described in any one of Claim 1-3, selecting the plurality of gamma curve In any one before, farther include:
The result obtained based on the analysis by described first image, determines to roll-off according to picture characteristics and turns Point；With
The high grade grey level equal to or more than the described flex point of roll-offing determined in described first image is rolled Fall processes.
Method the most according to claim 4, wherein determine described in flex point of roll-offing include: analyze institute Stating the rectangular histogram of the first image, to calculate, n% is high or higher high gray scale frequency, and according to described meter The high gray scale frequency adaptability ground calculated roll-offs flex point described in determining, wherein n is less than the natural number of 100.
Method the most according to claim 5, before analyzing described first image, wraps further Include:
Determine that input picture is HDR image or SDR image according to option image；With
Described input picture is walked around when described input picture is SDR image, and when described input figure When seeming HDR image, described input picture is provided as described first image.
7. an image processing circuit, including:
Roll-off processor, described in roll-off processor based on by having the of HDR (HDR) The analysis of one image and the result that obtains, determine flex point of roll-offing according to picture characteristics, and to described first figure The high grade grey level equal to or more than the described flex point of roll-offing determined in Xiang carries out process of roll-offing, in order at tool Display in the display device of standard dynamic range (SDR) is had to have described first image of HDR；With
Image mapper, described image mapper is for bent the multiple gammas corresponding to described display device Select among line that there is described first image and the gamma curve of minimum integrated brightness error, and according to institute Described first image is converted to have second image of SDR by the gamma curve stating selection.
Image processing circuit the most according to claim 7, the wherein said processor that roll-offs includes:
Histogram analyzer, described histogram analyzer analyzes the rectangular histogram of described first image, to calculate And export that n% is high or higher high gray scale frequency, wherein n is less than the natural number of 100；With
Flex point of roll-offing determiner, described in roll-off the flex point determiner high gray scale frequency adaptation according to described calculating Property ground determine described in roll-off flex point.
Image processing circuit the most according to claim 7, wherein said image mapper includes:
Integrated brightness error detector, described first image is mapped to by described integrated brightness error detector There is each of the plurality of gamma curve of different high-high brightness, to calculate brightness by mistake at each frame Difference, accumulates the luminance errors of described calculating, and each detection for the plurality of gamma curve is tired Long-pending luminance errors；
High-high brightness determiner, described high-high brightness determiner the plurality of gamma curve each The gamma curve with described minimum integrated brightness error is selected among described integrated brightness error, and really Fixed and export the high-high brightness of gamma curve of described selection；With
HDR-SDR transducer, pre-corresponding to each gamma curve of described HDR-SDR transducer If selecting corresponding with the described high-high brightness determined among HDR-SDR conversion lookup table (LUT) LUT, and use the LUT of described selection that described first image is mapped as described second image.
Image processing circuit the most according to claim 9, farther includes:
Roll-off described in being arranged on the inner pressurd vessel selector in processor front, and described inner pressurd vessel selector is according to choosing Item of image determines that input picture is HDR image or SDR image, when described input picture is SDR Described input picture is walked around during image, and when described input picture is HDR image by described input Image is as the processor that roll-offs described in described first image offer extremely.
11. 1 kinds of display devices, including:
Display floater；
According to Claim 8 to the image processing circuit described in 10 any one；
Panel driver, described panel driver is for showing at described image in described display floater The image that reason circuit provides；With
Time schedule controller, described time schedule controller is used for controlling the driver' s timing of described panel driver,
Wherein said image processing circuit is arranged in described time schedule controller, is arranged on described sequencing contro Between device and described panel driver or be arranged at the front end of described time schedule controller.
12. display devices according to claim 11, farther include:
Back light unit, described back light unit is for irradiating light to described display floater；With
Backlight driver, described backlight driver is in response to the light modulation exported from described time schedule controller Value adjusts the brightness of described back light unit, and the use of described light modulation value is determined by described image processing circuit High-high brightness.
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